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The synthesis and characterization of thin fi lms of polyaniline/carbon nanotubes nanocomposites is reported, as well as their utilization as transparent electrodes in ITO-free organic photovoltaic devices. These fi lms are generated by interfacial synthesis, which provides them with the unique ability to be deposited onto any substrate as transparent fi lms, thus enabling the production of fl exible solar cells using substrates like PET. Very high carbon nanotube loadings can be achieved using these fi lms without signifi cantly affecting their transparency ( ≈ 80-90% transmittance at 550 nm). Sheet resistances as low as 300 Ω / ᮀ are obtained using secondary polyaniline doping in the presence of carbon nanotubes. These fi lms present excellent mechanical stability, exhibiting no lack in performance after 100 bend cycles. Flexible and completely ITO-free organic photovoltaic devices are built using these fi lms as transparent electrodes, and high effi ciencies (up to 2.27%) are achieved.

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